This collection of chapters is intended to help expand, organize, and enhance understanding of the scientific and clinical relevance of vestibular-related research. Articles present a well-developed body of research with both clinical and theoretical implications, including a variety of studies contributed by individuals from different backgrounds and with diverse orientations. This collection contains anatomical investigations, analyses of instruments designed to clinically assess spedcific functions, descriptive bahavioral studies, intervention research , literature reviews and analyses which place the existing research within the broader contex of scientific literature.